[2] Don Martín Island, with its trapezoidal shape and almost flat relief, has small rocky formations on the southwest side and on the east side there is an area known as La Península, which is a space where, in addition to a dock, there are also areas that house a contingent of workers who come to the island during the guano extraction season.
Don Martín Island is an important biogeographical point in terms of breeding sites for some species of marine birds such as the Peruvian booby (Sula variegata) and the Humboldt penguin (Spheniscus humboldti).
The underwater world of Don Martin Island shows an impressive landscape and a lot of life, where fish and invertebrates are the most representative taxonomic groups.
The most abundant species of fish are represented by the pejesapo (Gobiesox marmoratus), machete (Ethmidium maculatum), lorna (Sciaena deliciosa), etc.
Invertebrates among mollusks and crustaceans are the turban snail (Tegula atra), fan shell (Argopecten purpuratus), clam (Semele corrugata), plover (Semymitilus algosus), hairy crab (Cancer setosus), moon snail (Natica caneloensis), limpet (Fissurella crassa), small crab (Pilumnoides perlatus), wattleshell (Chiton cumingsii), etc.